Explain why a balloon that has been rubbed sticks to a wall for a while.

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The balloon has a net charge as a result of being rubbed. When
the balloon is brought near a wall, the net charge on the balloon
moves electrons around in the wall. As a result, a small region
near the balloon has a net charge of opposite sign than the
balloon. The overall wall is still electrically neutral; there are
now small regions that have net charges. The force from the
opposite signed charges in the balloon and the wall causes the
balloon to stick to the wall. There it will stay until enough
charge has leaked away to cancel the charge on the balloon.